Yarn-tensioning device for loom-shuttles



D. H. FOG'LE.

YARN TENsloNING DEVICE FOR Loom sHurTLEs.

APPLICATION FILED DEC. l5) |1920.

Patented Aug. 9, 1921 lu uamtoz earner este.

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Specification of I-.etters Patent. i Patented Aug'. 9, 11.9211..

Application filed December 15, 1920. Serial No. 431,057.

To all lwhom t 'may concern.'

Be it known that 1, DAVID HERBERT Foam, a citizen of the United States,residing at New Brookland, in the county of Lexington and State of South Carolina, have invented certain new and useful Improvements in Yarn-Tensionin Devices for Loom-Shuttles, of which t e following is a Specification, reference being had to the accompanying drawings.

This invention relates to shuttles, and particularly to the 'yarn tensioning devices therefor. j l A r[he general vobject of this invention is to provide a tensioning device for heavy duck shuttles.

A further object is to provide means .for

placing such proper-tension on the yarn hat the yarn will not kink, lump or loop.

And a further object is to provide tensioning means so pdisposed Within the shuttle that it will always be safe and will not cut the warp yarn by screws orJ iron pins, that the tension shall not knock loose or become reduced in operation, and that the shuttle shall not cut the steel reeds. l

nother object is to provide a tensioning mechanism which can be used in connection with a .corrugated shuttle, and provide a vyarn tensiening device which may be used in connection with a tensioning strap dis-,

posed within the shuttle, the vforwardend of the strap being either hooked against the bottom of the shuttle or disposed in spaced relation to the bottom` of the shuttle.

A still further object is to provide a tensioning device which will revolve freely and which will not choke-up with any loose yarn.

A further object is to provide a shuttle with a tensioning strap attached at one end -to one end of the shuttle and at its other end attached at a point adjacent the bottom of the shuttle so that the pressure of the elastic strap holds the yarn inthe shuttle and keeps it from 'umping oft' in loops.

Other objects will appear in the coursev a of the following description.

My invention is illustrated in the accompanying drawings, whereinz- Figure 1 isa plan view of a shuttle-einbodying-the improvements of my invention; Fig. 2 is a sectional side elevation/thereof Ylzl`ig. 3 is a transverse 'sectional view on the line. 3-3 of Fig. 1;

Fig. 4 is a detail .perspective view of a hook plate employed and hereinafter specifically described.

Referring to these drawings, 10 designates 'posed within a spindle but is disposed more or less' loosely within the shuttle and held from forward movement by the ratchet toothedcorrugations 11. 011e end of the shuttle is formed as illustrated in Fig.. 2 with a seat 14, and passing over the se-at is the angular iron 1&5 held in place by adscrew 16. Disposed uponthe face of this seat beneath this iron 15 and extending downward to the bottom of the shuttleV is the strap 17. This strap is of elastic material and has a width slightly less than the interior width. of the shuttle, and at its forward end is provided with the ring 18. Attached to the bottom of the shuttle adjacent the opposite end thereof is a hook plate 19. This plate extends transversely of the shuttle, is somewhat arched at, itsy middle, and is attached at its ends by/screw 20. At its middle, the plate is formed with two downwardly eX- tending lugs 21 spaced from each other tol form an eye through which the yarn passes, and at its forward edge the plate is formed with an upwardly extending lug 22 constituting a hook and over which the ring 18 hooks. When theJ strap 17 is stretched and the ring 18 hooked over the lug 22, it is obvious that the strap will bear very tightly against the yarn awithin the shuttle and will press the yarn firmly against the bottom of the shuttle while not inrpeding more than is necessary the passage of the yarn a; through the eye 13 through the rotatable friction device" which I wlll now describe. The forward end of the shuttle is formed to provide a semiecircular chamber 23, as usual, with which the eye 13 communicates. Extending upward from the bottom yof the shuttle and axially disposed in this chamber is va bolt 24. This bolt projects upward lfrom the bottom ofthe shuttle and, as illusof the head projects below the bottom of the shuttle and so that this head cannot work out accidentally and so project. Surrounding this bolt is a circular, somewhat convex base 25 having a sleeve 26 extending up therefrom which immediately surrounds and sheaths the bolt and which is held in place by a nut 27, the screw-threads of the bolt 24 projecting above the nut 27. Disposed upon the base 25 is a polished disk 28 which is concave on its under face and convex on its upper face so as to fit down over the base 25. The middle portion of this annular disk 28 is somewhat flattened. Disposed upon the disk 28 is a concavo-conveX disk 29, the concave side facing the disk 28. The middle portion of this annularv disk is somewhat flattened so as to providetwo polished faces confronting each other. The disks 28 and 29 loosely surround the sleeve 26 andare free to rotate thereon.

" Surrounding the sleeve 26 and bearing upon the upper face of the disk 29 is an annular cap 30 flanged at its lower end, and bearing against the flange of this cap and urging it against the disk 29 is a coiled compression spring 31, the convolutions of vwhich grow gradually smaller toward the upper end of the spring. Bearing against the upper end of the spring is a nut 32 which'engages the bolt 24, and also engaging this bolt is a nut 33. These nuts 32 and 33, it will be seen, together constitute jam nuts or lock nuts so that when they are turned down to any desired point, the nut 33 will hold the 1 nut 32 from rotation. Thus the tension of the spring and` the degree of pressure eX- erted by the spring against the upper disk 29 may be delicately controlled. The yarn a passes between these disks 'and around the polished outer surface of the sleeve 26 and then lout through the eye 13. When the spring 31 is only slightly tensioned by the nuts32 and 33, only a slight tension is placed upon the plate 29. to force it toward the plate 28but as the tensionof the spring 31 is increased by turning downthe nuts 32 and 33, the tension of the plates upon the yarn will be increased to any desired extelit.

0f course, it will be obvious that the disks 28 and 29 may revolve as the yarn passes between thedisksand around the sleeve 26 and that the degree of resistance to this ropins, screws, or other devices thatv would act vfound that better cloth is made with less waste and with greater ease of operation by heavy duck shuttles having my improvement applied thereto than with thel ordinarly tensioning device.

It will be understood that the rotatable tensioning members 28 and 29 and allied parts may be used with a shuttle having a strap engaging device disposed adjacent the bottom of the shuttle or may be used with a strap engaging device disposed relatively distantfrom the bottom of the shuttle', and thus the device can be used in the spindleshuttle if desired. Where the hook lug 22 is disposed adjacent the bottom of the shuttle, it

acts to hold the elastic strap 17 down close to the bottom of the shuttle and thus the strap pressure holds the yarn and keeps it from jumping ofi' in loops. It will be-seen, that the yarn is guided between the prongs or lugs 21 to the tension disks.

The advantages of my improved duck shuttle over the shuttles ordinarily used for weaving duck, canvas and other heavy fabrics are many. In the ordinary duck shut? tle,the tensioning devices areheld in place by one or more transversely extending pins, and these pins being driven into the wood of the shuttle are very apt to work loose and when they work loose and workoutward they cut the warp yarn and are very liable to cut the reeds. In the ordinary duck shuttle, too, the tension'is regulated from the bottom by means of a screw-threaded tap and this screw is liable towork out while in use and thus out out the warp yarn. In my device the head of the bolt 24 is embedded in the bottom of the shuttle so that it cannot4 possibly touch or cut the warp yarns.

and further`it will be noted that the spring 31 bearing as it does against the nuts 32 and 33 would resist any downward movement `of the bolt whichwould cause its head to project below the. bottom surface of the shuttle. By using4 the member 25, having the upwardly projecting central portion 26 a firm support is given to the lower disk 28 and to the sleeve 30. This sleevef30 is necessary because thereby a firm pressure is secured .upon .the disk29 concentrically to the center of *the disk. It is to be particularly noted that as the top of the shuttle is open, the tension' of spring 31 may be adjusted at any time without disassembling lthe shuttle and that ifhit is necessary to remo've the disk29, the sleeve 30 and the spring, this is readily accomplished by simply removing the nuts 33. It will be noted that in my shuttle, the member 19 which form's the hook forengaging the forward end of the strap has spaced prongs 12. which guide the yarn to the tension device. This tensioning device consistassente ing of the disks 28 and 29 will not let the yarn kink in the cloth. rlhis tensioning device consisting of the parts 28 and 29 may also be used on a spindle shuttle, particularly if the forward end of the strap 17 be raised above the position it takes in a duck shuttle. Une of the chief advantages of my improved shuttle lies in its'reliability and simplicity. Another advantage resides in the easy manner in lwhich the tension may be adjusted.

claim 1. In a shuttle, an elastic strap having a width nearly that of the interior width of the shuttle and attached to that end of the shuttle remote from the yarn eye, the strap extending toward the yarn eye, and a metallic strip having downwardly turned ends attached to the bottom of the shuttle, said strip on its side adjacent the yarn eye being formed with anupwardly and forwardly projecting lug and at its opposite edge with a pair of downwardly projecting lugs formj ing yarn guides, the free end of the strap havin a ring engageable with said lug.

2. l a shuttle, an elastic strap having a width nearly that of the interior width of the shuttle and attached adjacent the bottom of the shuttle at that end of the shuttle remote from the yarn eye, the strap extending-toward theyarn eye, and a member attached to the ,bottom of the Shuttle formed to provide a guide for the yarn, and an upwardly and forwardly projecting lug, the free end of the strap having a ring engageable with said lug.

3. n/a loom shuttle having a yarn leye at one end, and open upon its upper face, a yarn guide within the shuttle, al tension device for the posed member, projecting upwardly from the bottom of the shuttle, two confronting disks mounted upon said member concentric shuttle.

yarn comprising a centrally dis-v ythereto and movable vertically upon the centrally disposed member, and between which disks the yarn passes to the eye, adjustable pressure means `carried on said member above the disks, and means carried on said member above the disks for adjusting the pressure of said pressure exerting means, said pressure exerting means and adjusting means being entirely removable from the member through the open upper face of the 4. In a loom shuttle having a yarn eye at one end, a yarn guide within the shuttle, a tensioning device for the yarn comprising a centrally disposed member, two disks disposed within the shuttle and rotatable upon said member, and between which disks the yarn passes to the eye, a spring bearing against one of said disks and urging it toward the other disk, and nuts engaging said member and bearing against the spring whereby the tension of the spring and the pressure exerted against the disks mayv be adjusted.

5. A loom shuttle having a yarn eye at one endand open upon its upper face, means for tensioning the yarn prior to itspassage through said eye comprising a screw-threaded bolt extending upward from the bottom of the shuttle, a base mounted upon the bolt and havin immediate y surronnding the bolt, a pair of confronting disks rotatably mounted upon said sleeve, a. coiled compression spring dis-A posed around the sleeve bearing against the upper disk and extending upward around the bolt, and nuts on the bolt bearing against the upper end of said spring whereby the tension of the spring may be adjusted.v

n testimony whereof hereunto aiix my signature.

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